Kaṭha Upaniṣad 4.15

4.15

yathodakaṃ śuddhe śuddham āsiktaṃ tādṛg eva bhavati /
evaṃ muner vijānata ātmā bhavati gautama //

15. As pure water poured forth into pure
Becomes the very same,
So becomes the soul (_ātman_), O Gautama,
Of the seer (_muni_) who has understanding.

4.15.p1

// iti caturthī vallī //

4.15.p2

puram ekādaśadvāram ajasyāvakracetasaḥ /
anuṣṭhāya na śocati vimuktaś ca vimucyate //

1. By ruling over the eleven-gated citadel Of the Unborn, the Un-crooked-minded one, One sorrows not. But when liberated [from the body], he is liberated indeed. This, verily, is That!